Apparatus for dressing pulp-wood grindstones



W. P. AIKIN.

APPARATUS FOR DRESSING PULP WOOD GHINDSTONES.

APPLICATION FILED DEC. Is, 1920.

1,406, 1 38. Patented Feb. 7, 1922.

m l :INVENTOR.

PATENT OFFICE.

WILLIAM r. AIKIN, or WATERTOWN, NEW ORK.

APPARATUS FOR DRESSING PULP-WOOD GRINDSTONES.

Specification of Letters Patent. Patented F'gb "7, 1922,

Application filed December 16, 1920. Serial No. 431,126.

To all ro/comet may concern:

Be it known that I, IVILLrAM P. AiiiiN, a citizen of the United States, residing at lVatertown, in the county of Jefferson and State of New York, have invented certain new and'useful Improvementsin Apparatus for Dressing Pulp-Wood Grindstones, of which the following is a specification, reference being had therein to the accompanying drawings. 7

This invention relates to method of and apparatus for dressing pulp-wood grindstones, and has for an object to provide a dressing for a grindstone conforming substantially to the present practice, but insuring uniformity and completeness of dressing not securable by the present practice.

In accordance with the present practice of dressing pulp-wood grindstones the desideratum i: :t production of a reticulated surface upon the periphery of the stone, the reticulat1on being in the form of closely associated pyramidal teeth interspersed by leadsin the form of deeper grooves, or furrows, for the purpose of conveying away the comminuted material resulting from the engagement of the pyramidal teeth with the fibres. As at present practiced, the grindstone is dressed by applying to the periphery a roller, or cylinder carrying a burr having ribs thereon, spaced in proper relation complementarily to the leads which it is desired to produce in the periphery of the stone, and by continued rotation of the two parts in forced engagement excavating the grooves, or leads, to the required depth. After this a different burr is substituted having a reticulated surface complementary to the pyramidal teeth, which forms the grinding surface of the stone by a like rotation under force. It is obvious that applying the two burrs separately will result in non-uniformity, not

only of the relation of the grindin teeth to the leads but the relation of the leads and grinding teeth to the cylindricity of the stone.

The present invention involves the use of a single burr having a peripheral surface complementary to the desired completed surface of the stone; that is to say, embodying ribs complementary to the leads, and striations complementary to the reticulated surface of the grinding teeth. The relation of the leads, as well as the striae of the reticulations to the cylindricity of the stone may be any relation required by the exigencies of use, orpersonal preference For instance, the leads may be in parallelism with the axis of the stone and the striae in parallelism and perpendicular respectively, or the leads and striae may be. spirally disposed, or the leads only may be spiral while the striec are respectively parallel with the axis and circumferential. The present invention is not limited in any way to the relation of the several parts to the cylindricity of the stone.

In the drawings:

Figure -1 is a vlew somewhat diagrammatic of a fragmentary portion of a grindstone with a burr in accordance with the present invention contacting therewith in dressing relation; 7

Figure 2 is a View in side elevation of a burr having the lead forming ribs and the striations in parallelism with the axis, and

Figures 3 and 4: show the ribs and the striations spirally disposed, the pitch of the spiral being different in the two figures.

Fig. 5 is a fragmentary view of another form of burr.

The pulp-wood grindstone indicated as an entirety at 10 is provided with leads 11 and vgrinding teeth 12. The grinding teeth 12 according to the present practice are closely associated pyramids, the apexes of which conform to the periphery of the grindstone with the leads excavated to a greater distance than the strize forming the grinding teeth. As heretofore explained, the leads 11 are under the present practice produced by a burr having ribs complementary only to those excavations, and after the leads are formed, a second burr is employed having a surface complementary to the grinding teeth. According to the present invention a burr indicated as an entirety at 13 is employed, which may be as found desirable, a hollow cylinder or a solid roller. Irrespective of its organized formation its surface is provided with a plurality of ribs 14 which are complementary to the leads 11 formed in the grindstone and interspersed pyramids 15 in the production of absolute uniformity of surface and thereforeproduce the greatest efliciency in operation by producing grindin teeth conforming accurately to the cylindrlcity of the stone and properly spaced relative to the leads.

' is, of course, journaled upon such a device as is usually employed for the purpose of extending radially beyond the striated surface.

2. An apparatus for dressing pulp-wood grindstones consisting of a burr having a The burr shown at 13' reticulated surface with ribs spaced upon and extending radially beyond the reticu-V closely associated pyramidal, grinding teeth,

the ap'exes of which conform to a cylinder, and ribs spaced relative to the grinding teeth extending radially beyond the teeth and conforming to a cylinder of greater radius than the cylinder of the teeth.

4. An apparatus for dressing pulp-wood grindstories, consisting of a cylindrical burr having a plurality of spaced reversely ta' pered ribs formed upon its periphery, with striations intermediate the ribs forming grinding teeth, the exterior ends of which conform to a cylinderof lesser radius than the cylinder of the ribs.

In testimony whereof I hereuntoailix my signature in presence of two witnesses;

Witnesses: a

' F. W. AIKIN, V

GRACE LQVLXNDREWS.

WILLIAM P. AIKIS. 

